Re: FTP Extensions for Cryptographic Hashes (draft-bryan-ftp-hash)

[Daniel Stenberg <daniel at haxx.se>]

On Wed, 24 Mar 2010, Anthony Bryan wrote:

> This ID proposes a feature where FTP clients can request the hash of a file. 
> A number of FTP clients and servers have implemented multiple commands 
> (XMD5, XSHA1, SITE SHOHASH, etc) that are not formally specified, leading to 
> non-interoperability and confusion.

Nice draft!

Here's one remark:

You use 550 as response code when the user isn't allowed to use the HASH 
command, but I find that 550 is otherwise often used for file-not-found in 
both SIZE, RETR and other responses.

Wouldn't it make sense to have a "file not found" response for when you try to 
HASH a non-existing file? Wouldn't it make sense to re-use the same error code 
(550) for that as other command use?

Maybe the "HASH not allowed" case can use 552 or 553?

--

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